Facebook's auth.promoteSession deprecated - alternatives?

I've been contacted by Facebook noting that the auth.promoteSession REST API is being deprecated on January 7th. My application uses this开发者_如何学编程 to generate a session token from our permanent access token so we can pass it along to the user's browser as a cookie.

We need this to allow the Facebook JavaScript API to be used without making the user login twice.

Has anyone come across an alternative to this API call?

They are holding off on deprecating this method until they have an alternative. https://github.com/facebook/facebook-ios-sdk/issues/issue/198